SharkHunter
New member
I found this bracelet and thought it was silver, After cleaning it and looking closely I noticed it was marked 900 not 925. Do you think its platinum? It weighs 11.3 Grams.
4) 90% platinum (900) - alloyed with 10% iridium "Classic Platinum" - Vickers hardness = 110
Again: Iridium has an atomic weight of 192.217 - pretty close to that of platinum.
10% iridium, by volume, is a touch over the volume of ruthenium required to equal 5% of our platinum.
By this measure (volume), 10% iridium platinum is only a bit less "pure" than 5% ruthenium platinum. 5% cobalt is miles away from being as pure as either.
This alloy is of upper-medium hardness - resists dents and dings well - is reasonably malleable - and requires less pressure to be imposed on a stone in the setting process than the harder alloys - is about as resistant to scratching as the 950 ruthenium blend and features all of the longevity that platinum is renowned for. This alloy works extremely well for both casting and hand fabrication. This is my platinum alloy of choice.
4) 90% platinum (900) - alloyed with 10% iridium "Classic Platinum" - Vickers hardness = 110
Again: Iridium has an atomic weight of 192.217 - pretty close to that of platinum.
10% iridium, by volume, is a touch over the volume of ruthenium required to equal 5% of our platinum.
By this measure (volume), 10% iridium platinum is only a bit less "pure" than 5% ruthenium platinum. 5% cobalt is miles away from being as pure as either.
This alloy is of upper-medium hardness - resists dents and dings well - is reasonably malleable - and requires less pressure to be imposed on a stone in the setting process than the harder alloys - is about as resistant to scratching as the 950 ruthenium blend and features all of the longevity that platinum is renowned for. This alloy works extremely well for both casting and hand fabrication. This is my platinum alloy of choice.